After he got out of his car and followed the kid, against the response from the 911 dispatcher. He went looking for trouble, and he found it.
He got out of his car to keep an eye on a 6'3" football-player muscular young man, while specifically NOT being a hero or wannabe-cop by calling in his situation to he police, and then following their suggestion (NOT any command) that further visual observation was unnecessary and walking back to his car.
Martin, however, ran away and then, on his own and unprovoked, circled back around and jumped Zimmerman and tried to beat him into severe injury or death, and was shot dead for his efforts.
So it is clear that it is Martin who, in fact, went looking for trouble and found it.
What is happening now to Zimmerman is due to people like you and Obama, who are inciting race war and judgement against all the known facts and the police report, without trial, in obvious racial prejudice against Zimmerman, as complete hypocrites, thereby endangering Zimmerman's life.
In other words, you're a liberal, and like all liberals, you believe anyone who disagrees with your agenda has "chosen death."